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friend class B;
private:
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};
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...
private:
A a;
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class A
{
public:
...
int Getx(){return X;}
friend class B;
private:
...
};
class B
{
public:
int get(A a){return a.Getx();}
//or int get(){return a.Getx();}
private:
A a;//ÔÚÓÃÓÑԱʱ²»Óö¨Òå
};

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